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Thermal Stress Measurements on Structural Defects

机译：结构缺陷的热应力测量

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The Federal Highway Administration (FHWA) Nondestructive Evaluation (NDE) Center is currently conducting testing to make full-field stress measurements of bridge weld details and of typical bridge defects. Measurements are being made with a thermoelastic stress measurement system in a laboratory environment. Test specimens include defects in compact-tension (CT) specimens, steel light pole supports, and 28-foot long steel girders containing a series of various weld details with defects. Thermoelastic stress measurements are made on specimens subjected to cyclic and random loading. The goal of the testing is to provide a full-field stress measurement of a weld detail or a defect area for the purpose of damage detection and assessment. The paper discusses recent results of testing and describes the capabilities of the system.
机译：联邦公路管理局（FHWA）无损评估（NDE）中心目前正在进行测试，以制定桥梁焊接细节和典型桥梁缺陷的全场应力测量。在实验室环境中使用热弹性应力测量系统进行测量。试样包括紧凑型张力（CT）标本，钢灯杆支撑件和28英尺长的钢梁，其中28英尺长的钢梁，其含有一系列各种焊接细节。在经过循环和随机加载的标本上进行热弹性应力测量。测试的目标是为焊接细节或缺陷区域提供全场应力测量，以损坏检测和评估。本文讨论了最近的测试结果，并描述了系统的能力。

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